India, Oct. 6 -- Optical illusions are becoming a sensation on the internet. Thousands of people around the world are taking part in these challenges to improve their observation skills. The latest brain teaser to go viral on Reddit asks players to spot a cat among cute raccoons in just five seconds. If you want to put your skills to the test, this challenge is perfect for you.

At first glance, there is an adorable crowd of wide-eyed raccoons. Most of them are just blinking innocently at you in different shades of gray. A few of them simply stand out. While one raccoon affectionately holds a red apple in the photo, another sports a yellow plaid scarf. Meanwhile, one raccoon, who wears a black top hat and a lacy veil, channels its vintage...